An automatic pressure application device for the production of modular composite air ducts

Abstract

The present invention relates to an automatic pressing device for the production of modular composite air ducts, which comprises four clamping and translation mechanisms. Each clamping and translation mechanism is composed of a translation component and a clamping component. The translation component includes a fixed long frame, a driving motor, a lead screw and a slider. The clamping component includes a clamping adjustment part, a first pressing roller and a second pressing roller. The first pressing roller and the second pressing roller are parallel to each other, and the ends on the same side are connected to the slider through the clamping adjustment part. The clamping adjustment part can adjust the distance between the first pressing roller and the second pressing roller to clamp or loosen the corresponding side wall of the rectangular air duct. The four fixed long frames are vertically and staggeredly arranged to form a rectangular frame in the middle, and at least one group of adjacent fixed long frames are respectively connected with telescopic mechanisms for pushing them to move. The advantages are that four pairs of corresponding first and second pressing rollers can comprehensively and evenly automatically press the four side walls of the rectangular air duct, with high production efficiency. After pressing, the inner and outer cylinders of the rectangular air duct adhere firmly to the sandwich insulation board, and the product quality is good.

Description

Technical Field

[0001] The invention belongs to the field of production equipment for modular composite air ducts, and particularly relates to an automatic pressing device for producing modular composite air ducts. Background Art

[0002] Modular composite air ducts are gradually being widely used. This product has the advantages of good airtightness, high strength, acid and alkali resistance, rust resistance, good sound insulation effect, and integral thermal insulation molding. Currently, the manufacturing processes of modular composite air ducts are diverse, and all adopt a production method mainly by hand and supplemented by mechanical tools. In this way, the production efficiency, cost, and quality control of the products cannot be guaranteed. Attached Figure 1 The process shown is the outer and inner cylinder manufacturing process often used in the production of composite air ducts. First, a single-layer color steel plate is bent and formed respectively to obtain an outer cylinder and an inner cylinder, and four pieces of thermal insulation materials of appropriate sizes are cut and double-sided glued. Then, the thermal insulation materials are placed between the inner and outer cylinders for assembly. After assembly, pressure is applied to make them adhere into one body, that is, a modular composite air duct is obtained. When making the sandwich thermal insulation material adhere to the inner and outer cylinders into one body, it is completed by manual pressing. The disadvantage is that when manually pressing the four side walls, it can only be done by feeling, and the acting point of the applied pressure is single. It is very difficult to ensure that the applied pressure is comprehensive and uniform. Therefore, there often occurs the problem that the sandwich thermal insulation material is not firmly adhered to the inner and outer cylinders and detaches, seriously affecting the product quality. Summary of the Invention

[0003] The invention provides an automatic pressing device for producing modular composite air ducts, aiming to solve the problems of low production efficiency and quality problems caused by the easy detachment of the sandwich thermal insulation board from the inner and outer cylinders when manually pressing to produce composite air ducts.

[0004] The technical solution of the invention to solve the above technical problems is as follows: An automatic pressing device for producing modular composite air ducts includes four clamping and translation mechanisms corresponding to the four side walls of a rectangular air duct one by one. Each clamping and translation mechanism is composed of a translation component and a clamping component. The translation component includes a fixed long frame, a driving motor, a lead screw, and a slider. The driving motor is fixed at one end of the fixed long frame. The lead screw is rotatably connected to both ends of the fixed long frame, and the output end of the driving motor is fixedly connected to one end of the lead screw through a coupling. The slider is located inside the fixed long frame and is in screw transmission connection with the lead screw. The clamping component includes a clamping adjustment part, a first pressing roller, and a second pressing roller. The first pressing roller and the second pressing roller are parallel to each other, and the ends on the same side are connected to the slider through the clamping adjustment part. The clamping adjustment part can adjust the distance between the first pressing roller and the second pressing roller to clamp or loosen the corresponding side wall of the rectangular air duct. The four fixed long frames are vertically and staggeredly arranged to form a rectangular frame in the middle, and at least one group of adjacent fixed long frames are respectively connected with a telescopic mechanism that pushes them to move to adjust the size of the rectangular frame.

[0005] On the basis of the above technical solution, the present invention can be further improved as follows.

[0006] Further, the clamping and adjusting part includes a first fixing block, a second fixing block and a plurality of limiting rods. The limiting rods pass through and are slidably fitted with the limiting holes formed in the first fixing block and the second fixing block. One end of the first pressing roller is fixedly connected to the first fixing block, and one end of the second pressing roller is fixedly connected to the second fixing block. Two parallel connecting ears extending out of the fixed long frame are fixed on the slider, and the two ends of the limiting rod are perpendicularly fixedly connected to the two connecting ears. Adjusting bolts or electric cylinders for adjusting the first fixing block and the second fixing block to approach or separate from each other are respectively provided on the two connecting ears.

[0007] The advantages of adopting the above further structural improvement are as follows: the structure is simple. The first fixing block and the second fixing block can slide along the limiting rods between the two connecting ears. When the adjusting bolts rotate or the electric cylinders extend and retract, it can better ensure that the first and second fixing blocks have only the freedom to approach or separate from each other, so as to stably drive the first and second pressing rollers to approach or separate from each other, realize the clamping and pressing of the side wall of the rectangular air duct or the release of the clamping after the full pressing to facilitate the removal of the rectangular air duct.

[0008] Further, the adjusting bolt is threadedly connected to the connecting ear and a check nut is threadedly connected to the adjusting bolt. The lower end of the adjusting bolt is rotatably connected to the corresponding first fixing block or second fixing block.

[0009] The advantages of adopting the above further structural improvement are as follows: manually adjusting the clamping and releasing the clamping is simple in operation; the structure is simple, and the production and maintenance costs are low.

[0010] Further, the telescopic mechanism is a multi-stage hydraulic cylinder.

[0011] The advantages of adopting the above further structural improvement are as follows: the multi-stage hydraulic cylinder can ensure a longer telescopic stroke, so as to push the corresponding fixed long frame to move in a larger range, so that the device is applicable to the automatic pressing of air ducts of more specifications.

[0012] Further, the four fixed long frames are arranged on a rectangular mounting plate. The rectangular mounting plate is vertically arranged. One pair of the fixed long frames is arranged in the vertical direction, and the other pair of the fixed long frames is arranged in the horizontal direction. Both ends of the fixed long frame located below are fixedly connected to the mounting plate through support rods. The fixed long frame located above is fixedly connected to the telescopic end of the telescopic mechanism, and the telescopic mechanism is fixedly connected to the upper side of the mounting plate through a fixing plate. The fixed long frame located on the left is fixed on the plate surface of the mounting plate. The fixed long frame located on the right is fixedly connected to the telescopic end of the other telescopic mechanism, and the telescopic mechanism is fixedly connected to the right side of the mounting plate through another fixing plate. Both the first pressing roller and the second pressing roller extend in the horizontal direction and are perpendicular to the plate surface of the mounting plate.

[0013] The advantages of the above further structural improvement are as follows: Since the four fixed long frames are arranged on a vertically arranged mounting plate, the first and second pressing rollers extend in the horizontal direction. When the rectangular air duct is being pressed, its axial direction is also in the horizontal direction, that is, when the rectangular air duct is loaded and unloaded onto this pressing device, it is pushed and pulled in the horizontal direction, which is convenient for loading and unloading. In addition, rectangular air ducts are usually placed horizontally, so this structure facilitates the subsequent matching of an automatic loading and unloading mechanism without the need to flip the air duct.

[0014] Further, the four driving motors are respectively located in front of the upper, lower, left, and right four side edges of the mounting plate.

[0015] The advantages of the above further structural improvement are as follows: It is beneficial to save the installation space on the same side edge, and the overall structure is more symmetrical.

[0016] Further, several positioning optical rods parallel to the lead screw are also fixed inside the fixed long frame. The slider is provided with a threaded hole and a light hole. The lead screw passes through the threaded hole, and the positioning optical rod passes through the light hole.

[0017] The advantages of the above further structural improvement are as follows: The positioning optical rod can prevent the slider from rotating or swinging, allowing it to have only the freedom to slide along the axial direction of the lead screw, ensuring that the first and second pressing rollers can move smoothly during translational pressing.

[0018] Further, the mounting plate is placed above the ground through a support frame or a liftable base.

[0019] The advantages of the above further structural improvement are as follows: It is convenient to adjust an appropriate loading height, which is convenient for operation.

[0020] Further, polytetrafluoroethylene coatings are provided on the roller surfaces of the first pressing roller and the second pressing roller that are in contact with the side wall of the rectangular air duct.

[0021] The advantages of the above further structural improvements are that the coating is smooth and wear-resistant, ensuring that the frictional resistance between the first and second pressure rollers and the side wall surface during translational pressing is minimized, making the translational pressing smoother.

[0022] Furthermore, each of the first and second pressure rollers includes a fixed shaft and a roller. One end of the fixed shaft is fixedly connected to the clamping and adjusting portion. The roller is sleeved on the fixed shaft, and ball bearings are clamped between both ends of the roller and the fixed shaft so that the roller can rotate relative to the fixed shaft.

[0023] The advantages of the above further structural improvements are that the sliding friction is changed to rolling friction, with smaller frictional force, making the translational pressing smoother.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] The clamping components of the four clamping and translational mechanisms can clamp the four side walls of the rectangular air duct from the inside and outside respectively through the first and second pressure rollers. Then, the drive motors in their respective translational components drive the sliders to translate through the lead screws, and the first and second pressure rollers translate accordingly, so that the four side walls of the rectangular air duct are automatically pressed comprehensively and evenly, with high production efficiency. After pressing, the inner and outer cylinders of the rectangular air duct adhere firmly to the sandwich insulation board, and the product quality is good. Brief Description of the Drawings

[0026] Figure 1 It is a schematic flow chart of processing a composite air duct using the inner and outer cylinder manufacturing process in the prior art;

[0027] Figure 2 It is a schematic diagram of an automatic pressing device for producing a modular composite air duct provided by the present invention;

[0028] Figure 3 For the present invention Figure 2 It is a sectional view of the clamping and translational mechanism extending in the left - right direction at the upper part of the automatic pressing device shown in the direction of the arrow;

[0029] Figure 4 For Figure 2 An enlarged schematic diagram (without showing the slider) of the clamping and translational mechanism extending in the left - right direction at the upper part of the automatic pressing device shown;

[0030] Figure 5 For Figure 2 A schematic diagram when the automatic pressing device shown presses the four side walls of the air duct automatically;

[0031] Figure 6 For Figure 3 A schematic diagram after replacing the adjusting bolt with an electric cylinder in ;

[0032] Figure 7Schematic diagram when a support frame is provided below the mounting plate;

[0033] Figure 8 Schematic diagram when a liftable base is provided below the mounting plate.

[0034] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0035] 1. Fixed long frame; 2. Driving motor; 3. Lead screw; 4. Slide block; 5. First pressure roller; 6. Second pressure roller; 7. Telescopic mechanism; 8. Fixed plate; 9. First fixing block; 10. Second fixing block; 11. Limit rod; 12. Connecting ear; 13. Adjusting bolt; 14. Electric cylinder; 15. Mounting plate; 16. Light hole; 17. Threaded hole; 18. Positioning optical rod; 19. Support frame; 20. Liftable base; 21. Fixed shaft; 22. Roller. Specific embodiments

[0036] The principles and features of the present invention will be described below in conjunction with the attached drawings and specific embodiments. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0037] In the description of the present invention, if terms indicating directions such as "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc. are used, the directions or positional relationships indicated are based on the directions or positional relationships shown in the attached drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be construed as a limitation to the present invention.

[0038] As Figures 2 to 8 shown, the present invention provides an automatic pressing device for the production of modular composite air ducts, which includes four clamping and translation mechanisms corresponding to the four side walls of a rectangular air duct one by one. Each of the clamping and translation mechanisms is composed of a translation component and a clamping component. The translation component includes a fixed long frame 1, a driving motor 2, a lead screw 3 and a slide block 4. The driving motor 2 is fixed at one end of the fixed long frame 1. The lead screw 3 is rotatably connected to both ends of the fixed long frame 1, and the output end of the driving motor 2 is fixedly connected to one end of the lead screw 3 through a coupling. The slide block 4 is located inside the fixed long frame 1 and is in screw transmission connection with the lead screw 3. The clamping component includes a clamping adjustment part, a first pressure roller 5 and a second pressure roller 6. The first pressure roller 5 and the second pressure roller 6 are parallel to each other, and the ends on the same side are connected to the slide block 4 through the clamping adjustment part. The clamping adjustment part can adjust the distance between the first pressure roller 5 and the second pressure roller 6 to clamp or loosen the corresponding side wall of the rectangular air duct. The four fixed long frames 1 are vertically and crosswise arranged to form a rectangular frame in the middle, and at least one group of adjacent fixed long frames 1 are respectively connected with a telescopic mechanism 7 that pushes them to move to adjust the size of the rectangular frame.

[0039] It should be noted that before automatic pressure application production, first, according to the size of the assembled rectangular air duct to be pressurized (as shown in Figure 1 ), the telescopic mechanism is used to move and adjust at least two fixed long frames perpendicular to each other, and at the same time, the slider is moved and adjusted to a suitable position by the driving motor (the four sliders correspond to the positions of the four corners of the rectangular air duct). Then, the rectangular air duct is inserted between four pairs of first and second pressure rollers and clamped by the clamping adjustment part (adjust the appropriate clamping pressure). Then, the driving motor is started to make the first and second pressure rollers move along the side wall of the air duct to apply pressure (as shown in Figure 5 ), so that the inner cylinder, the outer cylinder and the sandwich insulation board between them adhere into one body.

[0040] Among them, the driving motor preferably uses a servo motor, and each driving motor is electrically connected to the controller. Through the controller, the start and stop of the servo motor and the number of turns of rotation can be programmed to control the stroke of the slider. At the same time, the simultaneous start, sequential start in a certain order or other start modes of the four servo motors during pressure application can also be set, such as starting one servo motor at a time or starting two servo motors at a time, etc. Specifically, it can be flexibly selected according to needs.

[0041] In an embodiment of the present invention, as shown in Figure 3 and Figure 6 , the clamping adjustment part includes a first fixed block 9, a second fixed block 10 and a plurality of limit rods 11. The limit rods 11 pass through the limit holes opened on the first fixed block 9 and the second fixed block 10 and are in sliding fit. One end of the first pressure roller 5 is fixedly connected to the first fixed block 9, one end of the second pressure roller 6 is fixedly connected to the second fixed block 10. Two parallel connecting ears 12 extending out of the fixed long frame 1 are fixed on the slider 4. The two ends of the limit rod 11 are perpendicularly fixedly connected to the two connecting ears 12. Adjusting bolts 13 or electric cylinders 14 for adjusting the first fixed block 9 and the second fixed block to approach or separate from each other are respectively provided on the two connecting ears 12.

[0042] On the basis of the above technical solution, as shown in Figure 3 , the adjusting bolt 13 that is threadedly connected to the connecting ear 12 to adjust the movement of the first and second fixed blocks, and a check nut is threadedly connected to the adjusting bolt 13. The lower end of the adjusting bolt 13 is rotatably connected to the corresponding first fixed block 9 or second fixed block 10.

[0043] It should be noted that in order to prevent the first and second pressure rollers from being reversely rotated by the reaction force when pressing on the side wall of the air duct, it is necessary to set a check nut, which can prevent the adjusting bolt from reversing. The check nut can be threadedly connected to the adjusting bolts on both sides of the same connecting ear. After the check nut is tightened, the pressing force on the connecting ear increases the frictional force to prevent reversal.

[0044] In addition, preferably, the present invention adjusts the distance between the first fixed block and the second fixed block through an electric cylinder. The advantage is that electric adjustment is more convenient and can be electrically connected to a controller to achieve automatic control. For example, pressure sensors are arranged on the roller surfaces of the first pressure roller and the second pressure roller. The pressure sensors are electrically connected to the controller to timely feedback the pressure between the roller surface and the side wall of the air duct. Based on this, the controller can control the electric cylinder to automatically adjust the distance between the first and second fixed blocks.

[0045] In an embodiment of the present invention, the telescopic mechanism 7 is a multi-stage hydraulic cylinder.

[0046] In a preferred embodiment of the present invention, the four fixed long frames 1 are arranged on a rectangular mounting plate 15. The rectangular mounting plate 15 is vertically arranged. One pair of the fixed long frames 1 is arranged in the vertical direction, and the other pair of the fixed long frames 1 is arranged in the horizontal direction. Both ends of the fixed long frame 1 located below are fixedly connected to the mounting plate 15 through support rods. The fixed long frame 1 located above is fixedly connected to the telescopic end of the telescopic mechanism 7, and the telescopic mechanism 7 is fixedly connected to the upper side of the mounting plate 15 through a fixing plate 8. The fixed long frame 1 located on the left side is fixed on the plate surface of the mounting plate 15. The fixed long frame 1 located on the right side is fixedly connected to the telescopic end of another telescopic mechanism 7, and the telescopic mechanism 7 is fixedly connected to the right side of the mounting plate 15 through another fixing plate 8. The first pressure roller 5 and the second pressure roller 6 both extend in the horizontal direction and are perpendicular to the plate surface of the mounting plate 15.

[0047] It should be noted that the upper and right fixed long frames connected to the telescopic mechanism can both be translated under the drive of the telescopic mechanism. Therefore, these movable fixed long frames do not contact the plate surface of the mounting plate. In addition, in order to ensure that the fixed long frames can move freely without interfering with each other, the upper fixed long frame is farther away from the plate surface of the mounting plate than the right fixed long frame, so as to be staggeredly arranged. All of these can be achieved through the fixing plate.

[0048] In addition, it can be understood that the mounting plate can also be horizontally arranged. When it is horizontally arranged, each clamping and translation mechanism is arranged on the upper surface of the mounting plate. At this time, the first and second pressure rollers are vertically arranged, and the air duct to be pressed should also be in a vertical state when being pressed. The air duct is fed or discharged vertically to the pressing device.

[0049] In an embodiment of the present invention, as Figure 2As shown, the four drive motors 2 are respectively located in front of the upper, lower, left, and right sides of the mounting plate 15.

[0050] In an embodiment of the present invention, as Figure 4 and Figure 6 shown, four positioning optical rods 18 parallel to the lead screw 3 are also fixed inside the fixed long frame 1. The slider 4 is provided with a threaded hole 17 and a light hole 16. The lead screw 3 passes through the threaded hole 17, and the positioning optical rod 18 passes through the light hole 16.

[0051] As Figure 7 or Figure 8 shown, the mounting plate 15 is placed above the ground through the support frame 19 or the liftable base 20.

[0052] It should be noted that the liftable base can be a hydraulic lifting mechanism, such as a scissor lift table.

[0053] In an embodiment of the present invention, the roller surfaces of the first pressure roller 5 and the second pressure roller 6 in contact with the side wall of the rectangular air duct are both provided with a polytetrafluoroethylene coating. The specific function of the above structure is to reduce the friction coefficient and the sliding friction force.

[0054] In another embodiment of the present invention, the first pressure roller 5 and the second pressure roller 6 respectively include a fixed shaft 21 and a roller 22. One end of the fixed shaft 21 is fixedly connected to the clamping and adjusting part. The roller 22 is sleeved on the fixed shaft 21, and a ball bearing is clamped between both ends of the roller 22 and the fixed shaft 21 so that the roller 22 can rotate relative to the fixed shaft 21. The specific function of the above structure is to change the sliding friction into rolling friction during pressing, thereby reducing the friction force.

[0055] In the above embodiments, the lengths of the first pressure roller and the second pressure roller are slightly larger than the axial length of the air duct, preferably 120 - 150 cm; the telescopic stroke of the telescopic mechanism is preferably 30 - 200 cm; the moving stroke of the slider on the lead screw is preferably 30 - 200 cm; the distance between the first and second fixed blocks of the clamping and adjusting part is adjustable between 2 - 5 cm.

[0056] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An automatic pressing device for the production of modular composite air ducts, characterized in that, it includes four clamping and translation mechanisms corresponding to the four side walls of a rectangular air duct one by one. Each of the clamping and translation mechanisms is composed of a translation component and a clamping component. The translation component includes a fixed long frame (1), a driving motor (2), a lead screw (3) and a slider (4). The driving motor (2) is fixed at one end of the fixed long frame (1). The lead screw (3) is rotatably connected to both ends of the fixed long frame (1), and the output end of the driving motor (2) is fixedly connected to one end of the lead screw (3) through a coupling. The slider (4) is located inside the fixed long frame (1) and is in screw drive connection with the lead screw (3). The clamping component includes a clamping adjustment part, a first pressure roller (5) and a second pressure roller (6). The first pressure roller (5) and the second pressure roller (6) are parallel to each other, and the ends on the same side are connected to the slider (4) through the clamping adjustment part. The clamping adjustment part can adjust the distance between the first pressure roller (5) and the second pressure roller (6) to clamp or loosen the corresponding side wall of the rectangular air duct. The four fixed long frames (1) are vertically and staggeredly arranged to form a rectangular frame in the middle, and at least one group of adjacent fixed long frames (1) are respectively connected with a telescopic mechanism (7) for pushing them to move to adjust the size of the rectangular frame; The clamping adjustment part includes a first fixed block (9), a second fixed block (10) and a plurality of limit rods (11). The limit rods (11) pass through the limit holes opened on the first fixed block (9) and the second fixed block (10) and are in sliding fit. One end of the first pressure roller (5) is fixedly connected to the first fixed block (9), and one end of the second pressure roller (6) is fixedly connected to the second fixed block (10). Two parallel connection ears (12) extending out of the fixed long frame (1) are fixed on the slider (4). The two ends of the limit rod (11) are perpendicularly fixedly connected to the two connection ears (12). Adjusting bolts (13) or electric cylinders (14) for adjusting the first fixed block (9) and the second fixed block to approach or separate from each other are respectively provided on the two connection ears (12); the telescopic mechanism (7) is a multi-stage hydraulic cylinder.

2. The automatic pressing device for the production of modular composite air ducts according to claim 1, characterized in that, the adjusting bolt (13) is threadedly connected to the connection ear (12), and a check nut is threadedly connected to the adjusting bolt (13). The lower end of the adjusting bolt (13) is rotatably connected to the corresponding first fixed block (9) or second fixed block (10).

3. The automatic pressing device for the production of modular composite air ducts according to claim 1, characterized in that, Four of the fixed long frames (1) are arranged on a rectangular mounting plate (15), the rectangular mounting plate (15) is vertically arranged, a pair of the fixed long frames (1) are arranged in the vertical direction, and the other pair of the fixed long frames (1) are arranged in the horizontal direction. The two ends of the fixed long frame (1) located below are fixedly connected to the mounting plate (15) through support rods. The fixed long frame (1) located above is fixedly connected to the telescopic end of the telescopic mechanism (7), and the telescopic mechanism (7) is fixedly connected to the upper side of the mounting plate (15) through a fixing plate (8). The fixed long frame (1) located on the left side is fixed on the plate surface of the mounting plate (15), and the fixed long frame (1) located on the right side is fixedly connected to the telescopic end of the other telescopic mechanism (7), and the telescopic mechanism (7) is fixedly connected to the right side of the mounting plate (15) through another fixing plate (8). The first pressing roller (5) and the second pressing roller (6) both extend in the horizontal direction and are perpendicular to the plate surface of the mounting plate (15).

4. An automatic pressing device for producing modular composite air ducts according to claim 3, characterized in that, the four driving motors (2) are respectively located in front of the upper, lower, left and right four sides of the mounting plate (15).

5. An automatic pressing device for producing modular composite air ducts according to claim 3, characterized in that, a plurality of positioning optical rods (18) parallel to the lead screw (3) are also fixed in the fixed long frame (1). The slider (4) is provided with a threaded hole (17) and a light hole (16). The lead screw (3) passes through the threaded hole (17), and the positioning optical rod (18) passes through the light hole (16).

6. An automatic pressing device for producing modular composite air ducts according to claim 3, characterized in that, the mounting plate (15) is placed above the ground through a support frame (19) or a liftable base (20).

7. An automatic pressing device for producing modular composite air ducts according to claim 1, characterized in that, polytetrafluoroethylene coatings are provided on the roller surfaces of the first pressing roller (5) and the second pressing roller (6) that are in contact with the side wall of the rectangular air duct.

8. An automatic pressing device for producing modular composite air ducts according to claim 1, characterized in that, the first pressing roller (5) and the second pressing roller (6) respectively include a fixed shaft (21) and a roller (22). One end of the fixed shaft (21) is fixedly connected to the clamping and adjusting part. The roller (22) is sleeved on the fixed shaft (21), and ball bearings are clamped between the two ends of the roller (22) and the fixed shaft (21) so that the roller (22) can rotate relative to the fixed shaft (21).

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